Python问题是计算后我无法为“标签”设置新的计算值

Question

我想在 Python 上做一些简单的程序。 该程序计算您的正常体重。你写你的年龄和身高。 问题是计算后我无法为“标签”设置新的计算值 我该怎么做？

这是程序代码

from tkinter import *

def clicked():                  #button click
    p = int(age.get())          #try ti get value of your age from Entry
    b = int(height.get())       #try to get value of your height from Entry
    mas = int(50 + 0.75*(p - 150) + (b - 20) / 4)     #it is calculation
    lbl3.setvar(mas)                                 # here is a problem (i think)

window = Tk()
window.title('Ваш здоровый вес') 
window.geometry('200x200')

lblage = Label(window, text='Ваш возраст')      # Label for Age
lblage.grid(column=0, row=1)

age = Entry(window, width=5)                    # Entry for Age
age.grid(column=1, row=1)

lblheight = Label(window, text='Ваш рост')       #Label for height
lblheight.grid(column=0, row=2)                  

height = Entry(window, width=5)                 # Entry for height
height.grid(column=1, row=2)

button1 = Button(window, text='Получить значение', fg='green', command=clicked)    #Button 
button1.grid(column=0, row=5)

lbl2 = Label(window, text='Ваш здоровый вес')              
lbl2.grid(column=0, row=6)

lbl3 = Label(window)                            #here have to be our calculation
lbl3.grid(column=1, row=6)

window.mainloop()

程序看起来

错误是

 " Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Maxim03\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
  File "C:\Users\Maxim03\PycharmProjects\practice1\weight.py", line 7, in clicked
    lbl3.setvar(mas)
  File "C:\Users\Maxim03\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 709, in setvar
    self.tk.setvar(name, value)
TypeError: must be str, bytes or Tcl_Obj, not int"

我认为问题出在这里：

def clicked():
    p = int(age.get())
    b = int(height.get())
    mas = int(50 + 0.75*(p - 150) + (b - 20) / 4)
    lbl3.setvar(mas)

Answer 1

来自tkinter docs

Use the config() method to update multiple attrs subsequent to object creation
fred.config(fg="red", bg="blue")

改变它

lbl3.config(text=str(mas))

您还应该替换 Возраст 和 Рост - 它会正确计算健康体重，但现在不能

Answer 2

好的，所以这是一个非常容易解决的问题。如果您已将条目值转换为 int 进行计算，则返回值也是一个 int 值。标签文本不能是 int。只需在单击的函数中遵循此代码即可：

def clicked():
    p = int(age.get())
    b = int(height.get())
    mas = int(50 + 0.75*(p - 150) + (b - 20) / 4)
    lbl3.setvar(str(mas))

str() 使 mas 成为输入的字符串。

谢谢！